Found today at JB Hifi, a week before its official release on January 3rd, is Season 2.5 (the 6 episodes at the end of Season 2). The Beyond Entertainment website actually calls it Season 3.
It was AU$13 at JB, while the RRP is AU$15.
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It should be noted that it has "Combiner Force" on the cover, which is actually the title for the real Season 3. And this volume doesn't have a number, a bit like a one-off release.
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And for those wondering, Beyond Entertainment did end up releasing all 13 episodes of the first half of Season 2, on three volumes (December 2016, February 2017, and May 2017).
The hope was for a season 2 boxset by now, but I guess we should be lucky that we are seeing anything in a physical format, as they stopped producing Rescue Bots on DVD last year, and I think America didn't go beyond Season 1 of RID.